Praseodymium Oxide, also called Praseodymia, used to colour glasses and enamels; when mixed with certain other materials, praseodymium produces an intense clean yellow colour in glass. Component of didymium glass which is a colourant for welder's goggles, also as important additive of Praseodymium yellow pigments. Formula: Pr6O11 CAS No.: 12037-29-5 Molecular Weight: 1021.43 Appearance: Brown powder Solubility: Insoluble in water, moderately soluble in strong mineral acids Stability: Slightly hygroscopic Purity: Pr6O11/TREO 99.5%-99.9% TREO≥99% LOI≤1.0% Rare Earth Impurities: La2O3≤50ug/g CeO2≤300ug/g Nd2O3≤300ug/g Y2O3≤50ug/g Sm2O3≤100ug/g Non Rare Earth Impurities: Fe2O3≤50ug/g SiO2≤100ug/g CaO≤100ug/g Cl-≤300ug/g